<< I need the changes to "I've Got Rhythm" I don't
have access to a recording right now, and the two music stores in a nearby
city don't have it, not even in a book. I'll keep looking, but meanwhile,
I need the changes. Can you help? >>

Just like the blues, there are many variations of rhythm changes. The
standard changes that I've always used in a jazz context are:

add a b9 to the G7
substitute DMI7 in the place of the Bb in the third bar.
insert an Edim7 or EbMI7 in the second half of the 6th bar.

These are very standard variations....almost so much so that some groups
play them even when they're not actually written in the music.

Then from that point, there are litterally hundreds of different variations
being used. Most of these have alterations in the bridge. One of my favorite
"Altered Rhythm Changes" tunes is "Gertrude's Bounce" By Richie Powell
(played by Clifford Brown). Here are the changes: